bids in the summer

yes... that's dirty rushing and so much can happen between now and then that unless you're an in-house legacy for that sorority, you have no guarantee of getting in...

what sorority?

I'd rather not say, I don't want to get them in trouble. I am not a legacy.

No they didn't.

What should I do? I know I can't join the sorority now, but they are who I want to join!

If you really want to be in that sorority, go to the sub dinners and meet more people. if it was a sophomore who "offered you a bid"... well sophomores really don't have that much say and don't know what's really going on so they can't tell you if you're going to get a bid because the exec board could straight up not like you and then you're done. One person isn't enough to get you into a sorority.

but yeah, the best thing to do is rush them, but keep in mind they could totally screw you over and, unless you're a legacy, they probably will. A few sororities here are notorious for giving oral bids (I'd rather not say which 3 or 4 but you'll figure it out) and completely screw a bunch of pnms over... not always intentionally, mostly they just have no idea how rush works yet.
So my advice: rush that sorority, meet people, but keep an open mind and rush other groups too... you'll almost definitely end up withdrawing from rush if you suicide for just one with the idea that they're giving you a bid (which it kind of sounds like you're doing)

You people really need to get a fuqing life, like no joke you people are pathetic. who gives a fuq if you got an oral bid the person is probably lying anyway. you people obvious do not have much to worry about and should get your priorities straight

If you want that sorority go for it! They all rush dirty in every sorority anyways